i used to breed them, you can have 3 in a 2ft tank for about 5 years, i had 4 in a 3ft tank, one black female about 27cm and a whit male about 24cm and 2 off springs which were wild colour, if you want them to breed you need a planted tank, normal filter but not too strong, they dont like strong currents, clean waters just use tap if in auckland, auckland water clean and perfect, i fed mine steak, little bits of steak, you can hand feed them and they'll know you and come to you when its feeding time, you can handle them and the feel like and eel, all slimy, the colder the water the less you can feed, i use to feed mine once a week, they are cold water and can put in the fridge when on long monthly holidays, you can keep then in anything, don't need an air pump they have lungs and gills, keep away from direct sunlight and have hiding places, logs to sit on, try not to get tiny gravel and go for the large river rocks cause when you feed them they sometimes take big gulps and swallow the gravel. stuffs them up, you'll know the size of the steaks to feed them cause if too big they'll throw it back up, hearts are good but try and cut away from the fatty parts, they'll reall cool you'll grow to love em. breeding is easy to. dont buy the tucker from the pet shops they're no good just spoils your water heaps, they'll eat anything thats in front of them, use to feed mine tadpoles and wild guppies caught at the local pond too. not sure wat else to add so any other questions just ask. not hard to care for these things just an ice cream container forget about it for a week, good for kids.